Hi,
My apologies. Most of our available support time has been directed to our paid support channel these days.
I found the cause of this. There's a bad check that got slipped in. Basically, each issue bar listens for issue status change events, and determines from those whether the bar should update. The IDs are compared directly, and IDs are namespaced by the comment type (in your case, a General Comment and a Diff Comment). The check isn't properly comparing the comment type in one circumstance.
We'll get a fix into 4.0.7. This is, fortunately, less likely to impact things in normal daily use (this is our first time seeing this) due to the fact that Diff Comments tend to be more common than other types, and there's rarely going to be overlap of IDs on the same review request.
Christian